Photographic lens group

Abstract

The present invention provides a photographic lens group, which sequentially includes, from the incident light side to the emergent light side of the photographic lens group: a first lens, the first lens having a positive refractive power, the surface of the first lens close to the incident light side being convex, and the surface of the first lens close to the emergent light side being concave; a second lens, the second lens having a positive refractive power; a third lens, the third lens having a negative refractive power; a fourth lens, the fourth lens having a positive refractive power, the surface of the fourth lens close to the incident light side being convex; a fifth lens, the fifth lens having a negative refractive power, the surface of the fifth lens close to the incident light side being convex, and the surface of the fifth lens close to the emergent light side being concave; the combined focal length f34 of the third lens and the fourth lens, the central thickness CT3 of the third lens, and the central thickness CT4 of the fourth lens satisfy: -14 < f34 / (CT3 + CT4) < -11. The present invention solves the problem in the prior art that miniaturization and high image quality of the lens cannot be兼顾. It should be noted that the word "兼顾" in the original text seems to be a misspelling. It might be intended to be "balanced" or something similar for a more accurate translation. The above translation is based on the given text.

Description

[0001] This application is a divisional application of the invention patent filed on December 20, 2021, with application number 2021115650746 and invention title "Photographic Lens Group". Technical Field

[0002] This invention relates to the field of optical imaging equipment technology, and more specifically, to a photographic lens group. Background Technology

[0003] With the continuous iteration of mobile phone lenses, telephoto lenses are becoming increasingly diversified, such as 2X / 5X / 10X. However, the range from 2X to 5X is quite large, and some consumers may prefer 3X telephoto lenses. Due to the limitations of lens height, 3X lenses are not easy to mount on mobile devices, making it difficult to simultaneously achieve both miniaturization and high image quality.

[0004] In other words, existing technologies present a problem where miniaturization and high image quality cannot be achieved simultaneously. Summary of the Invention

[0005] The main objective of this invention is to provide a photographic lens group to solve the problem in the prior art that miniaturization and high image quality cannot be achieved simultaneously.

[0006] To achieve the above objectives, according to one aspect of the present invention, a photographic lens assembly is provided, comprising, sequentially from the light-incident side to the light-exit side of the photographic lens assembly: a first lens having positive refractive power, a convex surface near the light-incident side of the first lens, and a concave surface near the light-exit side of the first lens; a second lens having positive refractive power, with a convex surface near the light-incident side of the second lens; a third lens having negative refractive power, with a concave surface near the light-exit side of the third lens; a fourth lens having positive refractive power, with a convex surface near the light-incident side of the fourth lens; and a fifth lens having negative refractive power, with a convex surface near the light-incident side of the fifth lens and a concave surface near the light-exit side of the fifth lens; wherein the effective focal length f of the photographic lens assembly satisfies a relationship of 12mm with respect to the maximum field of view (FOV) of the photographic lens assembly. <f / tan(FOV)<17mm。

[0007] Furthermore, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f4 of the fourth lens satisfy the following condition: 0.6 < (f2 + f4) / f1 < 1.6.

[0008] Furthermore, the effective focal length f3 of the third lens and the effective focal length f5 of the fifth lens satisfy: 3.4 <f5 / f3<4.4。

[0009] Furthermore, the radius of curvature R1 of the surface of the first lens near the light-incident side and the radius of curvature R2 of the surface of the first lens near the light-outceasing side satisfy the following condition: 2.6 < (R2 + R1) / (R2 - R1) < 4.0.

[0010] Furthermore, the radius of curvature R3 of the surface of the second lens near the incident light side and the radius of curvature R6 of the surface of the third lens near the exit light side satisfy the following relationship: 1.1 <R3 / R6<1.6。

[0011] Furthermore, the radius of curvature R9 of the surface of the fifth lens near the light-incident side and the radius of curvature R10 of the surface of the fifth lens near the light-outceasing side satisfy the following condition: 6.0 < (R9 + R10) / (R9 - R10) < 8.2.

[0012] Furthermore, the maximum field of view (FOV) of the photographic lens group satisfies: 30° <FOV<45°。

[0013] Furthermore, the combined focal length f12 of the first lens and the second lens, the center thickness CT1 of the first lens, and the center thickness CT2 of the second lens satisfy the following relationship: 2.2 <f12 / (CT1+CT2)<2.9。

[0014] Furthermore, the combined focal length f34 of the third and fourth lenses, the center thickness CT3 of the third lens, and the center thickness CT4 of the fourth lens satisfy the following relationship: -14 <f34 / (CT3+CT4)<-11。

[0015] Furthermore, the combined focal length f1234 of the first lens, second lens, third lens, and fourth lens, and the axial distance BFL from the surface of the fifth lens near the light-emitting side to the imaging plane of the photographic lens group satisfy the following condition: 1.5 <f1234 / BFL<2.0。

[0016] Furthermore, the edge thickness ET3 of the third lens and the edge thickness ET2 of the second lens satisfy the following condition: 2.1 <ET3 / ET2<2.9。

[0017] Furthermore, the air gap T45 between the fourth and fifth lenses on the optical axis of the photographic lens group, and the edge thickness ET4 of the fourth lens and the edge thickness ET5 of the fifth lens satisfy the following condition: 0.8 <T45 / (ET4+ET5)<1.5。

[0018] According to another aspect of the present invention, a photographic lens assembly is provided, comprising, sequentially from the light-incident side to the light-outcident side of the photographic lens assembly: a first lens having positive refractive power, a convex surface near the light-incident side of the first lens, and a concave surface near the light-outcident side of the first lens; a second lens having positive refractive power, and a convex surface near the light-incident side of the second lens; a third lens having negative refractive power, and a concave surface near the light-outcident side of the third lens; a fourth lens having positive refractive power, and a convex surface near the light-incident side of the fourth lens; and a fifth lens having negative refractive power, and a convex surface near the light-incident side of the fifth lens, and a concave surface near the light-outcident side of the fifth lens; wherein the combined focal length f34 of the third lens and the fourth lens, the center thickness CT3 of the third lens, and the center thickness CT4 of the fourth lens satisfy the following relationship: -14 <f34 / (CT3+CT4)<-11。

[0019] Furthermore, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f4 of the fourth lens satisfy the following condition: 0.6 < (f2 + f4) / f1 < 1.6.

[0020] Furthermore, the effective focal length f3 of the third lens and the effective focal length f5 of the fifth lens satisfy: 3.4 <f5 / f3<4.4。

[0021] Furthermore, the radius of curvature R1 of the surface of the first lens near the light-incident side and the radius of curvature R2 of the surface of the first lens near the light-outceasing side satisfy the following condition: 2.6 < (R2 + R1) / (R2 - R1) < 4.0.

[0022] Furthermore, the radius of curvature R3 of the surface of the second lens near the incident light side and the radius of curvature R6 of the surface of the third lens near the exit light side satisfy the following relationship: 1.1 <R3 / R6<1.6。

[0023] Furthermore, the radius of curvature R9 of the surface of the fifth lens near the light-incident side and the radius of curvature R10 of the surface of the fifth lens near the light-outceasing side satisfy the following condition: 6.0 < (R9 + R10) / (R9 - R10) < 8.2.

[0024] Furthermore, the maximum field of view (FOV) of the photographic lens group satisfies: 30° <FOV<45°。

[0025] Furthermore, the combined focal length f12 of the first lens and the second lens, the center thickness CT1 of the first lens, and the center thickness CT2 of the second lens satisfy the following relationship: 2.2 <f12 / (CT1+CT2)<2.9。

[0026] Furthermore, the combined focal length f1234 of the first lens, second lens, third lens, and fourth lens, and the axial distance BFL from the surface of the fifth lens near the light-emitting side to the imaging plane of the photographic lens group satisfy the following condition: 1.5 <f1234 / BFL<2.0。

[0027] Furthermore, the edge thickness ET3 of the third lens and the edge thickness ET2 of the second lens satisfy the following condition: 2.1 <ET3 / ET2<2.9。

[0028] Furthermore, the air gap T45 between the fourth and fifth lenses on the optical axis of the photographic lens group, and the edge thickness ET4 of the fourth lens and the edge thickness ET5 of the fifth lens satisfy the following condition: 0.8 <T45 / (ET4+ET5)<1.5。

[0029] Applying the technical solution of this invention, the photographic lens group sequentially includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens from the light-incident side to the light-outcident side. The first lens has positive refractive power, with a convex surface near the light-incident side and a concave surface near the light-outcident side. The second lens has positive refractive power, with a convex surface near the light-incident side. The third lens has negative refractive power, with a concave surface near the light-outcident side. The fourth lens has positive refractive power, with a convex surface near the light-incident side. The fifth lens has negative refractive power, with a convex surface near the light-incident side and a concave surface near the light-outcident side. The combined focal length f34 of the third and fourth lenses, the center thickness CT3 of the third lens, and the center thickness CT4 of the fourth lens satisfy the following relationship: -14. <f34 / (CT3+CT4)<-11。

[0030] By setting both the first and second lenses to positive refractive power, the photographic lens group can effectively converge incident light, facilitating the entry of imaging light into subsequent lenses. The third lens, with negative refractive power, helps correct chromatic aberration within the lens group. It also elevates the light source, reducing vignetting and allowing more light to enter the lens group, ensuring its imaging function. The combination of a positive refractive power fourth lens and a negative refractive power fifth lens converges light, reducing aberrations. The fifth lens has a convex surface near the incident light and a concave surface near the exit light, minimizing the risk of ghosting. The different refractive powers of the third and fourth lenses, when controlled to combine their focal length, facilitate chromatic aberration correction; simultaneously, controlling the center thickness of the third and fourth lenses ensures lens shape retention. Attached Figure Description

[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 A schematic diagram of the photographic lens group of Example 1 of the present invention is shown;

[0033] Figures 2 to 5 They are shown respectively Figure 1 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the photographic lens group;

[0034] Figure 6 A schematic diagram of the photographic lens group of Example 2 of the present invention is shown;

[0035] Figures 7 to 10 They are shown respectively Figure 6 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the photographic lens group;

[0036] Figure 11 A schematic diagram of the photographic lens group of Example 3 of the present invention is shown;

[0037] Figures 12 to 15 They are shown respectively Figure 11 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the photographic lens group;

[0038] Figure 16 A schematic diagram of the photographic lens group of Example 4 of the present invention is shown;

[0039] Figures 17 to 20 They are shown respectively Figure 16 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the photographic lens group;

[0040] Figure 21 A schematic diagram of the photographic lens group of Example 5 of the present invention is shown;

[0041] Figures 22 to 25 They are shown respectively Figure 21 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the photographic lens group.

[0042] The above figures include the following reference numerals:

[0043] STO, Aperture Stop; E1, First Lens; S1, Surface of the First Lens near the Light Inlet; S2, Surface of the First Lens near the Light Outlet; E2, Second Lens; S3, Surface of the Second Lens near the Light Inlet; S4, Surface of the Second Lens near the Light Outlet; E3, Third Lens; S5, Surface of the Third Lens near the Light Inlet; S6, Surface of the Third Lens near the Light Outlet; E4, Fourth Lens; S7, Surface of the Fourth Lens near the Light Inlet; S8, Surface of the Fourth Lens near the Light Outlet; E5, Fifth Lens; S9, Surface of the Fifth Lens near the Light Inlet; S10, Surface of the Fifth Lens near the Light Outlet; E6, Filter; S11, Surface of the Filter near the Light Inlet; S12, Surface of the Filter near the Light Outlet; S13, Imaging Surface. Detailed Implementation

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0046] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0047] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0048] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0049] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens near the object side is called the surface of the lens near the incident light side, and the surface of each lens near the image side is called the surface of the lens near the exit light side. The surface shape in the paraxial region can be determined according to the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine concavity or convexity. For the object side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0050] To address the problem of the inability to simultaneously achieve miniaturization and high image quality in existing lenses, this invention provides a photographic lens group.

[0051] Example 1

[0052] like Figures 1 to 25 As shown, the photographic lens group, from the light-incident side to the light-outcident side, includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens in sequence. The first lens has positive refractive power, with a convex surface near the light-incident side and a concave surface near the light-outcident side. The second lens has positive refractive power, with a convex surface near the light-incident side. The third lens has negative refractive power, with a concave surface near the light-outcident side. The fourth lens has positive refractive power, with a convex surface near the light-incident side. The fifth lens has negative refractive power, with a convex surface near the light-incident side and a concave surface near the light-outcident side. The effective focal length f of the photographic lens group satisfies a relationship of 12mm with the maximum field of view (FOV) of the photographic lens group. <f / tan(FOV)<17mm。

[0053] By setting both the first lens and the second lens to have positive refractive powers, it is beneficial for the photographic lens group to converge the incident light, facilitating the imaging light to enter the subsequent lenses. The third lens is set to have a negative refractive power, which is beneficial for correcting the chromatic aberration of the photographic lens group. At the same time, the third lens can also elevate the light and reduce vignetting, enabling more light to enter the photographic lens group and ensuring the imaging function of the photographic lens group. The cooperation of the fourth lens having a positive refractive power and the fifth lens having a negative refractive power can converge the light and reduce the aberration. The surface of the fifth lens near the light incident side is convex, and the surface of the fifth lens near the light exit side is concave, which can reduce the risk of ghost images. Controlling f / tan(FOV) within a reasonable range helps to reasonably set the effective focal length and the field of view angle of the photographic lens group, is beneficial for compressing the size of the photographic lens group, and also results in small light deflection.

[0054] Preferably, the effective focal length f of the photographic lens group and the maximum field of view angle FOV of the photographic lens group satisfy: 14 mm < f / tan(FOV) < 16 mm.

[0055] In this embodiment, the effective focal lengths f1 of the first lens, f2 of the second lens, and f4 of the fourth lens satisfy: 0.6 < (f2 + f4) / f1 < 1.6. Reasonably controlling the focal lengths of the photographic lens group can control the refractive power distribution of the photographic lens group. On the one hand, it is beneficial for correcting the aberration of the photographic lens group; on the other hand, it can control the shapes of the lenses at different positions, thus being beneficial for optimizing the ghost images of the photographic lens group. Preferably, 0.7 < (f2 + f4) / f1 < 1.4.

[0056] In this embodiment, the effective focal length f3 of the third lens and the effective focal length f5 of the fifth lens satisfy: 3.4 < f5 / f3 < 4.4. Controlling the focal length ranges of the two negative lenses, the third lens and the fifth lens, can control the light path, which is beneficial for the better matching of the optical photographic lens group with the chip. Preferably, 3.5 < f5 / f3 < 4.3.

[0057] In this embodiment, the radius of curvature R1 of the surface of the first lens near the light incident side and the radius of curvature R2 of the surface of the first lens near the light exit side satisfy: 2.6 < (R2 + R1) / (R2 - R1) < 4.0. Reasonably controlling the surface of the first lens near the light incident side and the surface of the first lens near the light exit side can, on the one hand, avoid too large refractive power, resulting in too large aberration and difficult later correction; on the other hand, avoid too small refractive power, leading to insufficient converging ability of the lens, so as to ensure the imaging quality of the photographic lens group. Preferably, 2.7 < (R2 + R1) / (R2 - R1) < 3.9.

[0058] In this embodiment, the curvature radius R3 of the surface of the second lens close to the light incident side and the curvature radius R6 of the surface of the third lens close to the light outgoing side satisfy: 1.1 < R3 / R6 < 1.6. By controlling the curvature radius of the surface of the second lens close to the light incident side and the curvature radius of the surface of the third lens close to the light outgoing side, it can be ensured that the bending directions of these two surfaces are the same. In this way, the second lens and the third lens can be approximately regarded as a doublet lens, which is beneficial to the chromatic aberration correction of the photographic lens group. Preferably, 1.2 < R3 / R6 < 1.5.

[0059] In this embodiment, the curvature radius R9 of the surface of the fifth lens close to the light incident side and the curvature radius R10 of the surface of the fifth lens close to the light outgoing side satisfy: 6.0 < (R9 + R10) / (R9 - R10) < 8.2. By controlling the curvature radius of the surface of the fifth lens close to the light incident side and the curvature radius of the surface of the fifth lens close to the light outgoing side, the chip ghost image caused by chip reflection can be avoided. At the same time, the direction of the light rays emitted by the optical photographic lens group can be appropriately controlled, which is beneficial to the CRA matching of the photographic lens group. Preferably, 6.1 < (R9 + R10) / (R9 - R10) < 8.1.

[0060] In this embodiment, the maximum field angle FOV of the photographic lens group satisfies: 30° < FOV < 45°. By controlling the field angle of the photographic lens group, the equivalent focal length of the photographic lens group can be ensured, meeting the concept of the long focal length of the photographic lens group and meeting the needs of consumers to photograph distant objects. Preferably, 33° < FOV < 40°.

[0061] In this embodiment, the combined focal length f12 of the first lens and the second lens, the central thickness CT1 of the first lens, and the central thickness CT2 of the second lens satisfy: 2.2 < f12 / (CT1 + CT2) < 2.9. The above conditional formula takes into account both the focal length and the thickness of the lenses in the photographic lens group. On the one hand, it ensures the central thickness of the lenses, and on the other hand, it ensures that the lenses are not too curved. Both aspects are beneficial to the molding of the lenses. Preferably, 2.3 < f1 / (CT1 + CT2) < 2.8.

[0062] In this embodiment, the combined focal length f34 of the third lens and the fourth lens, the central thickness CT3 of the third lens, and the central thickness CT4 of the fourth lens satisfy: -14 < f34 / (CT3 + CT4) < -11. The refractive powers of the third lens and the fourth lens are different. By controlling their combined focal length, it is beneficial to chromatic aberration correction; at the same time, by controlling the central thicknesses of the third lens and the fourth lens, the formability of the lenses can be ensured. Preferably, -13.5 < f34 / (CT3 + CT4) < -11.1.

[0063] In this embodiment, the combined focal length f1234 of the first lens, the second lens, the third lens, and the fourth lens and the axial distance BFL from the surface of the fifth lens near the light-emitting side to the imaging surface of the photographic lens group satisfy: 1.5 < f1234 / BFL < 2.0. By controlling the combined focal length of the first four lenses, the incident height of light rays onto the last lens can be constrained, thereby controlling the height of the lens barrel, which is beneficial for miniaturizing the lens barrel; by controlling the axial distance from the surface of the fifth lens near the light-emitting side to the imaging surface, the telescopic length of the photographic lens group is controlled, which is beneficial for matching the motor stroke. Preferably, 1.6 < f1234 / BFL < 1.9.

[0064] In this embodiment, the edge thickness ET3 of the third lens and the edge thickness ET2 of the second lens satisfy: 2.1 < ET3 / ET2 < 2.9. By controlling the edge thicknesses of the two lenses, on the one hand, it is beneficial for the molding of the lenses; on the other hand, within a certain range of the edge thicknesses of the two lenses, considering the height of the light rays, it is beneficial for the stacking and arrangement of the lenses. Preferably, 2.2 < ET3 / ET2 < 2.85.

[0065] In this embodiment, the air gap T45 between the fourth lens and the fifth lens on the optical axis of the photographic lens group, the edge thickness ET4 of the fourth lens, and the edge thickness ET5 of the fifth lens satisfy: 0.8 < T45 / (ET4 + ET5) < 1.5. By controlling the thicknesses of the fourth lens and the fifth lens and the air gap, on the one hand, a thick spacer ring between the two lenses can be avoided, thereby avoiding stray light caused by the thick spacer ring; on the other hand, the molding process and assembly process of the fourth lens and the fifth lens can be ensured, which is beneficial for the reliability of the photographic lens group. Preferably, 0.9 < T45 / (ET4 + ET5) < 1.4.

[0066] Embodiment 2

[0067] As Figures 1 to 25 shown, sequentially from the light-incident side to the light-emitting side of the photographic lens group, it includes: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens has a positive refractive power, the surface of the first lens near the light-incident side is convex, and the surface of the first lens near the light-emitting side is concave; the second lens has a positive refractive power, and the surface of the second lens near the light-incident side is convex; the third lens has a negative refractive power, and the surface of the third lens near the light-emitting side is concave; the fourth lens has a positive refractive power, and the surface of the fourth lens near the light-incident side is convex; the fifth lens has a negative refractive power, the surface of the fifth lens near the light-incident side is convex, and the surface of the fifth lens near the light-emitting side is concave; wherein, the combined focal length f34 of the third lens and the fourth lens, the central thickness CT3 of the third lens, and the central thickness CT4 of the fourth lens satisfy: -14 < f34 / (CT3 + CT4) < -11.

[0068] By setting both the first lens and the second lens to have positive refractive powers, it is beneficial for the photographic lens group to converge the incident light, facilitating the imaging light to enter the subsequent lenses. The third lens is set to have a negative refractive power, which is beneficial for correcting the chromatic aberration of the photographic lens group. At the same time, the third lens can also raise the light and reduce vignetting, enabling more light to enter the photographic lens group and ensuring the imaging function of the photographic lens group. The cooperation of the fourth lens having a positive refractive power and the fifth lens having a negative refractive power can converge the light and reduce the aberration. The surface of the fifth lens near the light incident side is convex, and the surface of the fifth lens near the light exit side is concave, which can reduce the risk of ghost images. The refractive powers of the third lens and the fourth lens are different. By controlling their combined focal length, it is beneficial for chromatic aberration correction; at the same time, by controlling the central thicknesses of the third lens and the fourth lens, the formability of the lens can be ensured.

[0069] Preferably, the combined focal length f34 of the third lens and the fourth lens, the central thickness CT3 of the third lens, and the central thickness CT4 of the fourth lens satisfy: -13.5 < f34 / (CT3 + CT4) < -11.1.

[0070] In this embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f4 of the fourth lens satisfy: 0.6 < (f2 + f4) / f1 < 1.6. Reasonably controlling the focal length of the photographic lens group can control the refractive power distribution of the photographic lens group. On the one hand, it is beneficial for the aberration correction of the photographic lens group; on the other hand, it can control the shapes of the lenses at different positions, thus facilitating the optimization of ghost images of the photographic lens group. Preferably, 0.7 < (f2 + f4) / f1 < 1.4.

[0071] In this embodiment, the effective focal length f3 of the third lens and the effective focal length f5 of the fifth lens satisfy: 3.4 < f5 / f3 < 4.4. Controlling the focal length ranges of the two negative lenses, the third lens and the fifth lens, can control the light path, which is beneficial for the better matching of the optical photographic lens group with the chip. Preferably, 3.5 < f5 / f3 < 4.3.

[0072] In this embodiment, the radius of curvature R1 of the surface of the first lens near the light incident side and the radius of curvature R2 of the surface of the first lens near the light exit side satisfy: 2.6 < (R2 + R1) / (R2 - R1) < 4.0. Reasonably controlling the surface of the first lens near the light incident side and the surface of the first lens near the light exit side can, on the one hand, avoid too large refractive power, resulting in too large aberration and difficult correction later; on the other hand, avoid too small refractive power, leading to insufficient converging ability of the lens, so as to ensure the imaging quality of the photographic lens group. Preferably, 2.7 < (R2 + R1) / (R2 - R1) < 3.9.

[0073] In this embodiment, the curvature radius R3 of the surface of the second lens close to the light incident side and the curvature radius R6 of the surface of the third lens close to the light exiting side satisfy: 1.1 < R3 / R6 < 1.6. By controlling the curvature radius of the surface of the second lens close to the light incident side and the curvature radius of the surface of the third lens close to the light exiting side, it can be ensured that the bending directions of these two surfaces are the same. In this way, the second lens and the third lens can be approximately regarded as a doublet lens, which is beneficial to the chromatic aberration correction of the photographic lens group. Preferably, 1.2 < R3 / R6 < 1.5.

[0074] In this embodiment, the curvature radius R9 of the surface of the fifth lens close to the light incident side and the curvature radius R10 of the surface of the fifth lens close to the light exiting side satisfy: 6.0 < (R9 + R10) / (R9 - R10) < 8.2. By controlling the curvature radius of the surface of the fifth lens close to the light incident side and the curvature radius of the surface of the fifth lens close to the light exiting side, the chip ghost image caused by chip reflection can be avoided. At the same time, the direction of the light rays exiting the optical photographic lens group can be appropriately controlled, which is beneficial to the CRA matching of the photographic lens group. Preferably, 6.1 < (R9 + R10) / (R9 - R10) < 8.1.

[0075] In this embodiment, the maximum field angle FOV of the photographic lens group satisfies: 30° < FOV < 45°. By controlling the field angle of the photographic lens group, the equivalent focal length of the photographic lens group can be ensured, meeting the concept of the long focal length of the photographic lens group and meeting the needs of consumers to photograph distant objects. Preferably, 33° < FOV < 40°.

[0076] In this embodiment, the combined focal length f12 of the first lens and the second lens, the central thickness CT1 of the first lens, and the central thickness CT2 of the second lens satisfy: 2.2 < f12 / (CT1 + CT2) < 2.9. The above conditional formula takes into account both the focal length and the thickness of the lenses in the photographic lens group. On the one hand, it ensures the central thickness of the lenses, and on the other hand, it ensures that the lenses are not too curved. Both aspects are beneficial to the molding of the lenses. Preferably, 2.3 < f12 / (CT1 + CT2) < 2.8.

[0077] In this embodiment, the combined focal length f1234 of the first lens, the second lens, the third lens, and the fourth lens and the on-axis distance BFL from the surface of the fifth lens close to the light exiting side to the imaging surface of the photographic lens group satisfy: 1.5 < f1234 / BFL < 2.0. By controlling the combined focal length of the first four lenses, the incident height of the light rays to the last lens can be restricted, thereby controlling the height of the lens barrel, which is beneficial to the miniaturization of the lens barrel; by controlling the on-axis distance from the surface of the fifth lens close to the light exiting side to the imaging surface, the telescopic length of the photographic lens group is controlled, which is beneficial to matching the motor stroke. Preferably, 1.6 < f1234 / BFL < 1.9.

[0078] In this embodiment, the edge thickness ET3 of the third lens and the edge thickness ET2 of the second lens satisfy: 2.1 < ET3 / ET2 < 2.9. By controlling the edge thicknesses of the two lenses, on the one hand, it is beneficial to the molding of the lenses; on the other hand, within a certain range of the edge thicknesses of the two lenses, considering the height of the light, it is beneficial to the stacking and arrangement of the lenses. Preferably, 2.2 < ET3 / ET2 < 2.85.

[0079] In this embodiment, the air gap T45 between the fourth lens and the fifth lens on the optical axis of the photographic lens group, the edge thickness ET4 of the fourth lens, and the edge thickness ET5 of the fifth lens satisfy: 0.8 < T45 / (ET4 + ET5) < 1.5. By controlling the thicknesses of the fourth lens and the fifth lens and the air gap, on the one hand, it is possible to avoid placing a thick spacer ring between the two lenses, thus avoiding stray light caused by the thick spacer ring; on the other hand, it can ensure the molding process and assembly process of the fourth lens and the fifth lens, which is beneficial to the reliability of the photographic lens group. Preferably, 0.9 < T45 / (ET4 + ET5) < 1.4.

[0080] Optionally, the above-mentioned photographic lens group may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0081] The photographic lens group in this application can adopt multiple lenses, such as the five lenses mentioned above. By reasonably distributing the refractive power, surface shape, central thickness of each lens, and the axial distance between each lens, etc., it is possible to effectively increase the aperture of the photographic lens group, reduce the sensitivity of the lens, and improve the processability of the lens, making the photographic lens group more conducive to production and processing and applicable to portable electronic devices such as smart phones.

[0082] In this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are that the curvature continuously changes from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and improving astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality.

[0083] However, those skilled in the art should understand that without departing from the technical solution claimed in this application, the number of lenses constituting the photographic lens group can be changed to obtain the various results and advantages described in this specification. For example, although the five-lens example is described in the embodiments, the photographic lens group is not limited to including five lenses. If necessary, the photographic lens group may further include other numbers of lenses.

[0084] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of the photographic lens group applicable to the above embodiments.

[0085] It should be noted that any of the examples one through five below are applicable to all embodiments of this application.

[0086] Example 1

[0087] like Figures 1 to 5 As shown, the photographic lens group of Example 1 of this application is described. Figure 1 A schematic diagram of the photographic lens group structure of Example 1 is shown.

[0088] like Figure 1 As shown, the photographic lens group, from the light-incident side to the light-outcident side, includes an aperture stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

[0089] The first lens E1 has positive refractive power. Its surface S1, near the light-incident side, is convex, and its surface S2, near the light-outcident side, is concave. The second lens E2 has positive refractive power. Its surface S3, near the light-incident side, is convex, and its surface S4, near the light-outcident side, is convex. The third lens E3 has negative refractive power. Its surface S5, near the light-incident side, is concave, and its surface S6, near the light-outcident side, is concave. The fourth lens E4 has positive refractive power. Its surface S7, near the light-incident side, is convex, and its surface S8, near the light-outcident side, is convex. The fifth lens E5 has negative refractive power. Its surface S9, near the light-incident side, is convex, and its surface S10, near the light-outcident side, is concave. The filter E6 has a surface S11 near the light-incident side and a surface S12 near the light-outcident side. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged on the imaging surface S13.

[0090] In this example, the total effective focal length f of the photographic lens group is 10.57 mm, the total length TTL of the photographic lens group is 10.40 mm, and the image height ImgH is 3.47 mm.

[0091] Table 1 shows the basic structural parameters of the photographic lens group in Example 1, where the units for radius of curvature, thickness / distance, focal length, and effective radius are all millimeters (mm).

[0092]

[0093] Table 1

[0094] In Example 1, the surfaces of any one of the lenses, from the first lens E1 to the fifth lens E5, near the incident light side and near the exit light side are both aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0095]

[0096] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, and A26 that can be used for the aspherical mirrors S1-S10 in Example 1.

[0097]

[0098]

[0099] Table 2

[0100] Figure 2 The on-axis chromatic aberration curve of the photographic lens group in Example 1 is shown, which indicates the deflection of the focal point after light of different wavelengths passes through the photographic lens group. Figure 3 The astigmatism curves of the photographic lens group in Example 1 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 4 The distortion curves of the photographic lens group in Example 1 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. Figure 5 The magnification chromatic aberration curve of the photographic lens group in Example 1 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the photographic lens group.

[0101] according to Figures 2 to 5 As can be seen, the photographic lens group given in Example 1 can achieve good image quality.

[0102] Example 2

[0103] like Figures 6 to 10 The image shows a photographic lens group of Example 2 of this application. For the sake of brevity, descriptions similar to those in Example 1 will be omitted in this example and the following examples. Figure 6 A schematic diagram of the photographic lens group structure of Example 2 is shown.

[0104] like Figure 6 As shown, the photographic lens group, from the light-incident side to the light-outcident side, includes an aperture stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

[0105] The first lens E1 has positive refractive power. Its surface S1, near the light-incident side, is convex, and its surface S2, near the light-outcident side, is concave. The second lens E2 has positive refractive power. Its surface S3, near the light-incident side, is convex, and its surface S4, near the light-outcident side, is concave. The third lens E3 has negative refractive power. Its surface S5, near the light-incident side, is concave, and its surface S6, near the light-outcident side, is concave. The fourth lens E4 has positive refractive power. Its surface S7, near the light-incident side, is convex, and its surface S8, near the light-outcident side, is convex. The fifth lens E5 has negative refractive power. Its surface S9, near the light-incident side, is convex, and its surface S10, near the light-outcident side, is concave. The filter E6 has a surface S11 near the light-incident side and a surface S12 near the light-outcident side. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged on the imaging surface S13.

[0106] In this example, the total effective focal length f of the photographic lens group is 10.57 mm, the total length TTL of the photographic lens group is 10.40 mm, and the image height ImgH is 3.47 mm.

[0107] Table 3 shows the basic structural parameters of the photographic lens group in Example 2, where the units for radius of curvature, thickness / distance, focal length, and effective radius are all millimeters (mm).

[0108]

[0109]

[0110] Table 3

[0111] Table 4 shows the higher-order coefficients that can be used for each aspherical mirror in Example 2, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0112] Face number A4 A6 A8 A10 A12 A14 S1 -2.9231E-03 -2.1665E-03 9.4061E-04 -7.7604E-04 4.0330E-04 -1.1565E-04 S2 -4.2220E-03 -1.4417E-02 9.4149E-03 -2.4691E-03 2.6178E-04 2.7834E-05 S3 5.1789E-04 -1.4985E-02 9.4948E-03 -1.7734E-03 -1.5623E-05 -2.7166E-06 S4 1.2511E-02 -2.1278E-02 1.5807E-02 -4.7070E-03 -3.8833E-04 6.8620E-04 S5 -2.7805E-02 3.9923E-02 -2.6959E-02 1.3456E-02 -5.3270E-03 1.5669E-03 S6 -7.8017E-02 9.5066E-02 -8.7035E-02 7.1464E-02 -5.2268E-02 3.0551E-02 S7 -4.7791E-02 2.3330E-02 -5.2310E-03 -4.2310E-03 5.2704E-03 -2.8683E-03 S8 -3.1950E-02 1.6980E-02 -6.9440E-03 1.9169E-03 -3.1309E-04 3.6348E-05 S9 -1.3642E-01 1.6416E-02 1.5384E-02 -2.1666E-02 1.9255E-02 -1.3488E-02 S10 -1.3330E-01 3.2848E-02 2.1777E-03 -7.8289E-03 4.2724E-03 -1.2917E-03 Face number A16 A18 A20 A22 A24 A26 S1 1.9831E-05 -2.0907E-06 1.2661E-07 -3.3828E-09 0.0000E+00 0.0000E+00 S2 -1.3717E-05 2.0166E-06 -1.4245E-07 4.0948E-09 0.0000E+00 0.0000E+00 S3 3.2173E-05 -1.1672E-05 1.9015E-06 -1.5444E-07 5.0724E-09 0.0000E+00 S4 -2.0835E-04 3.0807E-05 -2.3116E-06 7.0394E-08 0.0000E+00 0.0000E+00 S5 -3.0898E-04 3.7223E-05 -2.4188E-06 6.3164E-08 0.0000E+00 0.0000E+00 S6 -1.2950E-02 3.7563E-03 -7.0193E-04 7.5859E-05 -3.5927E-06 0.0000E+00 S7 9.4380E-04 -1.9034E-04 2.1483E-05 -1.0315E-06 0.0000E+00 0.0000E+00 S8 -1.2216E-05 4.5924E-06 -8.6059E-07 6.2830E-08 0.0000E+00 0.0000E+00 S9 6.8725E-03 -2.3691E-03 5.1736E-04 -6.4339E-05 3.4643E-06 0.0000E+00 S10 2.3071E-04 -2.2107E-05 7.4607E-07 1.8425E-08 0.0000E+00 0.0000E+00

[0113] Table 4

[0114] Figure 7 The on-axis chromatic aberration curve of the photographic lens group in Example 2 is shown, which indicates the deflection of the focal point after light of different wavelengths passes through the photographic lens group. Figure 8 The astigmatism curves of the photographic lens group in Example 2 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 9 The distortion curves of the photographic lens group in Example 2 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. Figure 10The magnification chromatic aberration curve of the photographic lens group in Example 2 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the photographic lens group.

[0115] according to Figures 7 to 10 As can be seen, the photographic lens group given in Example 2 can achieve good image quality.

[0116] Example 3

[0117] like Figures 11 to 15 As shown, the photographic lens group of Example 3 of this application is described. Figure 11 A schematic diagram of the photographic lens group structure of Example 3 is shown.

[0118] like Figure 11 As shown, the photographic lens group, from the light-incident side to the light-outcident side, includes an aperture stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

[0119] The first lens E1 has positive refractive power. Its surface S1, near the light-incident side, is convex, and its surface S2, near the light-outcident side, is concave. The second lens E2 has positive refractive power. Its surface S3, near the light-incident side, is convex, and its surface S4, near the light-outcident side, is convex. The third lens E3 has negative refractive power. Its surface S5, near the light-incident side, is concave, and its surface S6, near the light-outcident side, is concave. The fourth lens E4 has positive refractive power. Its surface S7, near the light-incident side, is convex, and its surface S8, near the light-outcident side, is concave. The fifth lens E5 has negative refractive power. Its surface S9, near the light-incident side, is convex, and its surface S10, near the light-outcident side, is concave. The filter E6 has a surface S11 near the light-incident side and a surface S12 near the light-outcident side. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged on the imaging surface S13.

[0120] In this example, the total effective focal length f of the photographic lens group is 10.57 mm, the total length TTL of the photographic lens group is 10.40 mm, and the image height ImgH is 3.47 mm.

[0121] Table 5 shows the basic structural parameters of the photographic lens group in Example 3, where the units for radius of curvature, thickness / distance, focal length, and effective radius are all millimeters (mm).

[0122]

[0123] Table 5

[0124] Table 6 shows the higher-order coefficients that can be used for each aspherical mirror in Example 3, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0125] Face number A4 A6 A8 A10 A12 A14 S1 -3.4745E-03 -2.6042E-03 7.9196E-04 -4.9308E-04 2.8192E-04 -8.7941E-05 S2 4.3451E-04 -2.4311E-02 1.7332E-02 -5.9073E-03 1.1811E-03 -1.2671E-04 S3 5.0829E-03 -2.1709E-02 1.2444E-02 -2.6582E-04 -2.2887E-03 1.1816E-03 S4 2.0351E-02 -3.5954E-02 3.2305E-02 -1.6602E-02 5.1732E-03 -1.0007E-03 S5 -2.5581E-02 3.5263E-02 -2.1693E-02 9.4918E-03 -3.4008E-03 9.7283E-04 S6 -7.9320E-02 1.0052E-01 -9.1665E-02 7.0602E-02 -4.6945E-02 2.5211E-02 S7 -5.0425E-02 2.7343E-02 -8.1029E-03 -2.7133E-03 4.6875E-03 -2.7033E-03 S8 -3.7383E-02 2.1597E-02 -8.4615E-03 1.1607E-03 1.0117E-03 -8.0022E-04 S9 -1.4657E-01 2.4188E-02 1.1099E-02 -1.7074E-02 1.3751E-02 -9.1412E-03 S10 -1.4395E-01 4.1602E-02 -8.6164E-04 -8.2843E-03 5.3416E-03 -1.8581E-03 Face number A16 A18 A20 A22 A24 A26 S1 1.5918E-05 -1.7523E-06 1.1117E-07 -3.1405E-09 0.0000E+00 0.0000E+00 S2 1.6706E-06 1.2828E-06 -1.4184E-07 4.9981E-09 0.0000E+00 0.0000E+00 S3 -3.2308E-04 5.5135E-05 -5.9093E-06 3.6666E-07 -1.0116E-08 0.0000E+00 S4 1.1853E-04 -7.9786E-06 2.4226E-07 -7.7647E-10 0.0000E+00 0.0000E+00 S5 -1.9658E-04 2.5074E-05 -1.7820E-06 5.3450E-08 0.0000E+00 0.0000E+00 S6 -1.0030E-02 2.7727E-03 -4.9819E-04 5.1999E-05 -2.3824E-06 0.0000E+00 S7 9.0601E-04 -1.8331E-04 2.0614E-05 -9.8504E-07 0.0000E+00 0.0000E+00 S8 2.9052E-04 -6.0434E-05 6.8282E-06 -3.2287E-07 0.0000E+00 0.0000E+00 S9 4.7029E-03 -1.6804E-03 3.8215E-04 -4.9371E-05 2.7513E-06 0.0000E+00 S10 3.9624E-04 -5.0836E-05 3.5216E-06 -9.6711E-08 0.0000E+00 0.0000E+00

[0126] Table 6

[0127] Figure 12 The on-axis chromatic aberration curve of the photographic lens group in Example 3 is shown, which indicates the deflection of the focal point after light of different wavelengths passes through the photographic lens group. Figure 13 The astigmatism curves of the photographic lens group in Example 3 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 14 The distortion curves of the photographic lens group in Example 3 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. Figure 15 The magnification chromatic aberration curve of the photographic lens group in Example 3 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the photographic lens group.

[0128] according to Figures 12 to 15 As can be seen, the photographic lens group given in Example 3 can achieve good image quality.

[0129] Example 4

[0130] like Figures 16 to 20 As shown, the photographic lens group of Example 4 of this application is described. Figure 16 A schematic diagram of the photographic lens group structure of Example 4 is shown.

[0131] like Figure 16 As shown, the photographic lens group, from the light-incident side to the light-outcident side, includes an aperture stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

[0132] The first lens E1 has positive refractive power. Its surface S1, near the light-incident side, is convex, and its surface S2, near the light-outcident side, is concave. The second lens E2 has positive refractive power. Its surface S3, near the light-incident side, is convex, and its surface S4, near the light-outcident side, is convex. The third lens E3 has negative refractive power. Its surface S5, near the light-incident side, is convex, and its surface S6, near the light-outcident side, is concave. The fourth lens E4 has positive refractive power. Its surface S7, near the light-incident side, is convex, and its surface S8, near the light-outcident side, is concave. The fifth lens E5 has negative refractive power. Its surface S9, near the light-incident side, is convex, and its surface S10, near the light-outcident side, is concave. The filter E6 has a surface S11 near the light-incident side and a surface S12 near the light-outcident side. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged on the imaging surface S13.

[0133] In this example, the total effective focal length f of the photographic lens group is 10.57 mm, the total length TTL of the photographic lens group is 10.40 mm, and the image height ImgH is 3.47 mm.

[0134] Table 7 shows the basic structural parameters of the photographic lens group in Example 4, where the units for radius of curvature, thickness / distance, focal length, and effective radius are all millimeters (mm).

[0135]

[0136] Table 7

[0137] Table 8 shows the higher-order coefficients that can be used for each aspherical mirror in Example 4, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0138]

[0139]

[0140] Table 8

[0141] Figure 17 The on-axis chromatic aberration curve of the photographic lens group in Example 4 is shown, which indicates the deflection of the focal point after light of different wavelengths passes through the photographic lens group. Figure 18 The astigmatism curves of the photographic lens group in Example 4 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 19 The distortion curves of the photographic lens group in Example 4 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. Figure 20 The magnification chromatic aberration curve of the photographic lens group in Example 4 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the photographic lens group.

[0142] according to Figures 17 to 20 As can be seen, the photographic lens group given in Example 4 can achieve good image quality.

[0143] Example 5

[0144] like Figures 21 to 25 As shown, the photographic lens group of Example 5 of this application is described. Figure 21 A schematic diagram of the photographic lens group structure of Example 5 is shown.

[0145] like Figure 21 As shown, the photographic lens group, from the light-incident side to the light-outcident side, includes an aperture stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.

[0146] The first lens E1 has positive refractive power. Its surface S1, near the light-incident side, is convex, and its surface S2, near the light-outcident side, is concave. The second lens E2 has positive refractive power. Its surface S3, near the light-incident side, is convex, and its surface S4, near the light-outcident side, is concave. The third lens E3 has negative refractive power. Its surface S5, near the light-incident side, is convex, and its surface S6, near the light-outcident side, is concave. The fourth lens E4 has positive refractive power. Its surface S7, near the light-incident side, is convex, and its surface S8, near the light-outcident side, is concave. The fifth lens E5 has negative refractive power. Its surface S9, near the light-incident side, is convex, and its surface S10, near the light-outcident side, is concave. The filter E6 has a surface S11 near the light-incident side and a surface S12 near the light-outcident side. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged on the imaging surface S13.

[0147] In this example, the total effective focal length f of the photographic lens group is 10.57 mm, the total length TTL of the photographic lens group is 10.39 mm, and the image height ImgH is 3.47 mm.

[0148] Table 9 shows the basic structural parameters of the photographic lens group in Example 5, where the units for radius of curvature, thickness / distance, focal length, and effective radius are all millimeters (mm).

[0149]

[0150]

[0151] Table 9

[0152] Table 10 shows the higher-order coefficients that can be used for each aspherical mirror in Example 5, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0153] Face number A4 A6 A8 A10 A12 A14 S1 -3.7301E-03 -2.1123E-03 3.4979E-04 -4.8489E-04 4.4190E-04 -1.7184E-04 S2 7.3106E-03 -4.0318E-02 2.9955E-02 -1.1398E-02 2.8080E-03 -4.8194E-04 S3 1.3122E-02 -3.7834E-02 2.2186E-02 -1.9376E-03 -3.0847E-03 1.7340E-03 S4 3.1254E-02 -6.1401E-02 6.0949E-02 -3.6639E-02 1.4302E-02 -3.7265E-03 S5 -2.7805E-02 2.7817E-02 -7.6325E-03 -3.6695E-03 3.8645E-03 -1.5111E-03 S6 -7.8702E-02 1.0448E-01 -9.4200E-02 6.8687E-02 -4.3303E-02 2.2574E-02 S7 -4.3812E-02 2.7062E-02 -1.1322E-02 1.6470E-03 1.2743E-03 -9.5987E-04 S8 -4.3061E-02 3.0430E-02 -1.6997E-02 8.2578E-03 -3.6417E-03 1.4312E-03 S9 -1.5996E-01 2.8875E-02 6.0812E-03 -7.2438E-03 7.2588E-04 1.5753E-03 S10 -1.5184E-01 4.3847E-02 1.5173E-03 -1.1784E-02 7.6791E-03 -2.8250E-03 Face number A16 A18 A20 A22 A24 A26 S1 3.5831E-05 -4.2872E-06 2.8026E-07 -7.8127E-09 0.0000E+00 0.0000E+00 S2 5.7351E-05 -4.4873E-06 2.0589E-07 -4.1611E-09 0.0000E+00 0.0000E+00 S3 -4.8289E-04 8.2566E-05 -8.8258E-06 5.4626E-07 -1.5060E-08 0.0000E+00 S4 6.4474E-04 -7.1024E-05 4.4950E-06 -1.2404E-07 0.0000E+00 0.0000E+00 S5 3.3382E-04 -4.3573E-05 3.1274E-06 -9.4857E-08 0.0000E+00 0.0000E+00 S6 -8.8238E-03 2.3965E-03 -4.2124E-04 4.2846E-05 -1.9085E-06 0.0000E+00 S7 3.2885E-04 -6.5048E-05 7.0798E-06 -3.2497E-07 0.0000E+00 0.0000E+00 S8 -4.3873E-04 9.1465E-05 -1.1256E-05 6.1421E-07 0.0000E+00 0.0000E+00 S9 -9.9120E-04 2.8532E-04 -4.4285E-05 3.4437E-06 -9.6572E-08 0.0000E+00 S10 6.5599E-04 -9.5107E-05 7.8774E-06 -2.8512E-07 0.0000E+00 0.0000E+00

[0154] Table 10

[0155] Figure 22 The on-axis chromatic aberration curve of the photographic lens group in Example 5 is shown, which indicates the deflection of the focal point after light of different wavelengths passes through the photographic lens group. Figure 23 The astigmatism curves of the photographic lens group in Example 5 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 24 The distortion curves of the photographic lens group in Example 5 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. Figure 25 The magnification chromatic aberration curve of the photographic lens group in Example 5 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the photographic lens group.

[0156] according to Figures 22 to 25 As can be seen, the photographic lens group given in Example 5 can achieve good image quality.

[0157] In summary, Examples 1 through 5 satisfy the relationships shown in Table 11.

[0158] Conditional / Example 1 2 3 4 5 f / tan(FOV)(mm) 14.87 14.93 15.00 15.06 15.06 (f2+f4) / f1 0.81 1.20 1.05 1.26 1.32 f5 / f3 4.12 4.18 3.72 3.62 3.76 (R2+R1) / (R2-R1) 3.75 2.88 3.19 3.05 3.01 R3 / R6 1.45 1.27 1.29 1.41 1.36 (R9+R10) / (R9-R10) 6.26 7.15 6.57 7.33 8.01 FOV (°) 35.4 35.3 35.2 35.1 35.1 f12 / (CT1+CT2) 2.46 2.77 2.64 2.65 2.73 f34 / (CT3+CT4) -11.32 -12.13 -13.17 -12.77 -11.64 f1234 / BFL 1.76 1.81 1.77 1.81 1.84 ET3 / ET2 2.79 2.70 2.60 2.48 2.37 T45 / (ET4+ET5) 1.19 1.24 1.31 1.13 1.04

[0159] Table 11

[0160] Table 12 gives the effective focal length f of the photographic lens groups in Examples 1 to 5, with the effective focal lengths f1 to f5 for each lens.

[0161] Example parameters 1 2 3 4 5 f1(mm) 16.32 13.25 14.42 13.85 13.81 f2 (mm) 7.04 8.85 7.98 8.22 8.60 f3 (mm) -3.75 -4.28 -4.30 -4.91 -5.09 f4 (mm) 6.22 7.02 7.18 9.18 9.59 f5 (mm) -15.43 -17.87 -15.98 -17.75 -19.13 f(mm) 10.57 10.57 10.57 10.57 10.57 TTL(mm) 10.40 10.40 10.40 10.40 10.39 ImgH(mm) 3.47 3.47 3.47 3.47 3.47 FOV (°) 35.40 35.29 35.16 35.06 35.06

[0162] Table 12

[0163] This application also provides an imaging device, whose electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the photographic lens group described above.

[0164] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0165] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0166] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0167] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A photographic lens group, characterized by comprising: The photographic lens set has five lenses with refractive power, sequentially including, from an entrance side of the photographic lens set to an exit side of the photographic lens set: a first lens having positive refractive power, a surface close to the entrance side of the first lens being a convex surface, and a surface close to the exit side of the first lens being a concave surface; a second lens having positive refractive power, a surface close to the entrance side of the second lens being a convex surface; a third lens having negative refractive power, a surface close to the exit side of the third lens being a concave surface; a fourth lens having positive refractive power, a surface close to the entrance side of the fourth lens being a convex surface; a fifth lens having negative refractive power, a surface close to the entrance side of the fifth lens being a convex surface, and a surface close to the exit side of the fifth lens being a concave surface; wherein a combined focal length f34 of the third lens and the fourth lens, a central thickness CT3 of the third lens, and a central thickness CT4 of the fourth lens satisfy: -13.17≤f34 / (CT3+CT4)≤-11.32; an effective focal length f1 of the first lens, an effective focal length f2 of the second lens, and an effective focal length f4 of the fourth lens satisfy: 0.81≤(f2+f4) / f1≤1.

32.

2. The photographic lens set according to claim 1, characterized in that, an effective focal length f3 of the third lens and an effective focal length f5 of the fifth lens satisfy: 3.62≤f5 / f3≤4.

18.

3. The photographic lens set of claim 1, wherein, a curvature radius R1 of the surface close to the entrance side of the first lens and a curvature radius R2 of the surface close to the exit side of the first lens satisfy: 2.88≤(R2+R1) / (R2-R1)≤3.

75.

4. The photographic lens set of claim 1, wherein, a curvature radius R3 of the surface close to the entrance side of the second lens and a curvature radius R6 of the surface close to the exit side of the third lens satisfy: 1.27≤R3 / R6≤1.

45.

5. The photographic lens set of claim 1, wherein, a curvature radius R9 of the surface close to the entrance side of the fifth lens and a curvature radius R10 of the surface close to the exit side of the fifth lens satisfy: 6.26≤(R9+R10) / (R9-R10)≤8.

01.

6. The photographic lens set of claim 1, wherein, a maximum field of view FOV of the photographic lens set satisfies: 35.1°≤FOV≤35.4°.

7. The photographic lens set of claim 1, wherein, a combined focal length f12 of the first lens and the second lens, a central thickness CT1 of the first lens, and a central thickness CT2 of the second lens satisfy: 2.46≤f12 / (CT1+CT2)≤2.

77.

8. The photographic lens set of claim 1, wherein, a combined focal length f1234 of the first lens, the second lens, the third lens, and the fourth lens, and an on-axis distance BFL from the surface close to the exit side of the fifth lens to an imaging surface of the photographic lens set satisfy: 1.76≤f1234 / BFL≤1.

84.

9. The photographic lens set of claim 1, wherein, an edge thickness ET3 of the third lens and an edge thickness ET2 of the second lens satisfy: 2.37≤ET3 / ET2≤2.

79.

10. The photographic lens set of claim 1, wherein, An air space T45 on an optical axis of the photographing lens group between the fourth lens and the fifth lens, an edge thickness ET4 of the fourth lens, and an edge thickness ET5 of the fifth lens satisfy: 1.04 ≤ T45 / (ET4+ET5) ≤ 1.

31. An air space T45 on an optical axis of the photographing lens group between the fourth lens and the fifth lens, an edge thickness ET4 of the fourth lens, and an edge thickness ET5 of the fifth lens satisfy: 1.04 ≤ T45 / (ET4+ET5) ≤ 1.

31. An air space T45 on an optical axis of the photographing lens group between the fourth lens and the fifth lens, an edge thickness ET4 of

Images